VEHICLES, CAMPERS, and BOATS > Powerplant, Driveline, and Braking

4WD noise?

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stewie:
my old jeep was quite noisy in 4wd... i knew those gears were churning up front. My suburban is a bit at well. with my limited knowledge i'd say it's a little binding.

I learned its always important to have matching tires and matching tread depth on a 4wd.

KensAuto:
Might be front diff/driveline, bit I would guess it's probably nothing Sam. Front diff slop along with front driveline being a little "tight" will cause normal noise above 25mph on a lot of older vehicles, especially on hard pack.

Sammconn:
Well Ken, I hate to say it, but you look to be correct...again.

Went for a drive tonight.
On the real slippery stuff just about ended in the ditch when the power let go from traction.
40 ish mph, lots of slip, no noise.
Got on some minimal traction road, no noise all speeds.
Back on slippery stuff, 50 mph nailed it, noise was there again, until the front tires broke loose as well.

So it appears that I may well be nothing other than rear traction lesser than front, loading everything up and making some unusual sounds.
I'm still going to thaw it out and have a good look at everything but I think I'm ok after all.

I guess I've never left it in 4wd on dry stuff before, or I had the radio too loud to notice maybe.

Wilbur:
Are your gear ratios slightly different? I know in my old Land Cruiser the back was 4.10 and front was 4.09 or 4.11 (or vice versa I forget now) but that slight difference was enough where I had to take it out of 4WD as soon as I was on pavement or it would cause problems. I'm sure uneven tire wear could effectively do the same thing even with the same gear ratio.

Sammconn:
It's a stock 2006 Silverado. As far as I know I've got 3.73 front and rear.
The tires were new in the fall, and have maybe 10k on them. No wear to speak of at all.

I think it's a case of not 100% traction and a bit of wheel slip that is causing it.

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